Radio Control Scale Bob & Dolly Wischer AERONCA K lives again Forty-three years ago young newlyweds search adventure lure flight became irresistible four-year-old Aeronca K offered sale low price $650 couple Scalemodeling friends K acquired flight training began us investing tremendous sum $217 After 50 hours training Department Commerce flight inspector punctured dream bubble ultimatum get better airplane flight tests reasons Aeroncas two-cylinder engine single ignition absence wheel brakes modeling partners unwilling invest further airplanes made decision continue training Lycoming-powered Taylorcraft another $600 Yes used airplanes cheap 1941 uninflated dollars T-craft four cylinders again single ignition heel-operated wheel brakes nearly useless airplane satisfied inspectors require ments pilots license soon acquired Being avid Scale modelers days now carefully measured made photo records both airplanes Drawings made intention reproducing craft model form ty-three years later quarter-scale ninefoot-span Aeronca K finally finished flying built drawings conjunction Paul Matt Historical Aviation Album Volume 15 remarkable coincidence license number shown Pauls drawings NC19345 airplane Album photos shows parked front hangar Milwaukees Mitchell Field As Scale models K built few pencil linesthere no model construction drawings decision build Aeronca -scale spurred notable similarity OS Gemini 120 twin two-cylinder Aeronca-built engine K Its overall dimensions almost exactly correct Only shaft length seriously out-of-scale being too long scale propeller hub counterbored its back side compensate added length Gemini crankcase disguised sheet aluminum simulate Aeron ca case casting project started Sport Scale airplane could also flown Giant Scale competition its final form can additionally compete FAI Preci sion class airplane its detail quite complete 12 lb well within weight limits Wing loading very reas onable 20 oz per sq ft lightweight Sig Aeroscale wheels have ribbed treads ground off smooth contributes scale ap pearance Grinding done placing wheel shaft lubricate bear ing pressing ribbed tire tread against spinning sanding disc angle tire being slowly revolved excess rubber compound removed trick getting shaft proper angle tire isnt spun too rapidly system permits rapid uniform removal rubber resulting scuffed surface has look tire has seen landings showing genuine wear Aeronca covered Sig Kover heat-shrunk medium setting heat-sealing tool Too much heat can collapse light structure After shrinking Koverall given three coats non tautening butyrate dope two coats color lightweight finish Due its light weight K has very wide speed envelope flight open throttle speed obviously too high Scale realism model will float along loss altitude throttle U Ken Ames modlled Jemco kit %-scaie Douglas SBD-5 Dauntless ww II aive aomoer IL t-inisn acrylic evamei engine 03 90 weight 1175 lb super finish acrylic lacquer over silk dope atop coat K&Batin ep6xy used Dennis Wanns Hawker Sea Fury R %-scaie 77-in-span British carrier fighter weighs 15 lb uses OS 108 FSR power Deibert McGehes Sport Scale Grumman XF5F-1 Skyrocket L exhibited Toledo Power pair HB 40s Other features include operational wing flaps Spring Air retractable landing gear Finish acrylic lacquer documentation imported Poland Larry Gordons Precision Scale PZL P-23 Karas R built British MAP drawings Twenty-pound Polish light bomber Quadra-powered 48 Model Aviation setting just above idle True Scale speed quite readily attained However under windy conditions realism suffers models ground speed varies drastical ly between upwind downwind head ings Ground speed can altered throttle changes During attempted three-point landing strong wind ground speed could near zero crosswind taxiing also quite adven ture can borrow idea Sailplane fellows add some weight CG increase airspeed wind velocity beyond point manage ability bit useful weight could four-ampere Ni-Cd cell on-board glow ignition fuel 2-stroke engines has home-brew mixture methanol 20% castor oil 5% nitromethane Gemini seems thrive ratio would prefer avoid having type fuel various engines Lets pretend engine sounds realistic compared fullsize doesnt Sound different certainly less annoying two-stroke 9000 rpm contrasted 2300 full-size spoils illusion model has approximately 100 brazed silver-soldered aluminumsoldered joints its structure Wing Continued page 152 September 1984 49 Bob Dolly learned fly prototype quarter-scale Aeronca K back 1941 clue can find Precision Scale model l real thing ii blades grass look proportionally too largel Bob built lightIts under 12 lb Structure completely assembled Super Jet cyanoacrylate glue Power OS Gemini 12 cu 4-stroke twin-cylinder engine perfect dimensions model Bob diagulsed OSs exhaust pipe look like prototypes carburetor air Intake pipecomplete simulated air cleanerlcarb heater box Functional shock-strut landing gear brazed assembly steel tubes Right Stufl UampDeii enjoys realism safety System 303 Lectra-Starters beautiful F7F Tiger Cat 422 Main St Dept MA Irwin PA 15642 Phone 412 864-4959 Send $150 today receive fully illustrated catalog BY LEE TAYLOR MAA POUNDER & PRO PHOTOGRAPhER SUPER two-hour long video cumu lative product TEN YEARS active shooting Featuring 165 LB GRUMMAN GOOSE 16 8-17 16 SPRUCE GOOSE MASTERS CHAMPION SHIPS AMA NATIONALS & MORE Recorded VHS Hi-Grade Video Tape $3495 C&EIF eRSIDENTs $3705 It TAC SEND 5A5E P05 DES SEND CREEK 05 MONEY ORDER TO recovery back course plan worked much better year lean towards types record-setting flights its worth passing whatand howthe experts plan Obviously weather biggest fac torjust behind safety Late spring early summer seem provide best odds good lift conditions However outsmart fickle winds Jack company have set up four basic courses direction north east south west. directions would planned grid pattern farmland country roads doesnt include courses other directions farm roads have very little traf fic selected reasons safety Besides low traffic roads sidestep towns planning near perfect May 26 however wind direction could have better Out northwest 10 24 knots quartering tailwind cause course correc tions hoped since lift light throughout flight No long runs made between thermals course required fourteen 900 turns flight work being Declared Distance attempt meant landing take place within 300 meters spot AMA record 500 meters FAI record Starting 1100 am landing 441 pm 5410 flight covered 9147 miles 14729 kilometers new AMA record tentative FAI record AMA record breaks Dale Folkenings 4282 miles set October 1982 Dale Contest Director Jacks flight Nice guy plane used Pegasus plan No 307 Model Aviation August 1980 copy holds current Open Distance record 10412 miles Altitude record 6025 feet now hangs AMA museum flight ran Braidwood IL south Urbana IL Villa Grove May 27 young Brian Isenhart flew stock Aquila using Miller airfoil modification 126 miles set new record Junior category Still feeling good about June 3 Brian set Standard-class Altitude record 3000 feet plane specially-designed fuselage capable carrying Replogle barograph Photos will appear next months column reference AMA model air plane records March1984 see June 1984 issue Model Aviation page 119 Im finally going put snow shovels away Postal contest Back April 1984 col umn results given Pinellas Soaring Associations postal contest An invitation also offered inter ested clubs compete second postal meet Six clubs countries com peted onea contest dif ferent twist As mentioned back April tasks contest would include sixminute Duration spot landing four-lap F3B Speed kicker would both tasks would flown same weight during same round Results Club Southern Soaring Club Brisbane Pinelas White Sheet FSV Versmold Wellington Country South Africa Australia USA England Germany New Zealand Points 26156 25134 23457 20253 19262 9732 club team scored its best five fliers Best Speed time 240 seconds John Lightfoot South Africa John also best individual score four rounds 6127 team Germany flew fly ing wings Bad weather plagued con test two maxes recorded best Speed time 39 seconds Incidently Sean Walbank top British flier contest edits publishes fine magazine called White Sheet Its quarterly Spring 1984 issue crammed over 40 pages flying wing designs Austria Eng land Germany USA years subscription five English pounds its pound well spent Send subscription request Sean Walbank Editor 29 Gardens Acreman St Sherborne Dorset DT9 3PD England youre interested next postal contest write Kale Harden 3184 Brunswick Circle Palm Harbor FL 33563 USA Good Lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 RC ScalelWischers Continued page 49 struts alone made gum hard wood have 24 silver-solder joints fittings Some aluminum soldering done hobby-shop-type tubing 015 wall thickness can bit tricky Too much heat parts fall floor molten globules Too little heat solder will flow desirable fillet Two critical factors determine success brazing aluminum-soldering silver-soldering small model parts flame intensity brazing-rod diameter flame must completely adjustable must held work longer time necessary obtain good flow fillet being formed rod diameter too great heat will needed melt rod heat parts being joined meltdown parts real hazard As mod el size increases have found need brazed joints smaller models used almost have produced lot scrap learning join light metal pieces greatest advantage brazed joints strength available small light parts helps reduce overall model weight 1937 Aeronca K two-place side-by-side trainer sport-type airplane also known Scout followed C-3 Master 1936 used same basic two-cylinder E-l 13C engine built Aeronca earlier models updated 40 45 horspower its final form K became KC four-cylinder Continental A-40 engine K same span chord wing36 ft 50 inas C-3 152 Model AviationContinued page 154 Great footage BEST GIANT SCALE SEAPLANES SPORT FLYING UNUSUAL AIRCRAFT HELICOPTERS & MASTERS SCALE CHAMPIONS AC K-U-TROLL ER 6 Channel Direct Servo Controller Kit PuIe & Fane gate adiuaable Erar NuitvtabIe 06 Nng 0 Psi PuItes Cis-u-TROtLEn Car Entwkuostjaei NiCd SOtno banern Cho vaNS included No need tie up frestuency have pro bleto airplane Plug ACK-U-TROILER aod chech engine elevator ailerons upto 6 Ehan nels Receiver modification rettuired some radios uhinple build simple use five 5 slide pots contrOl 5 channels switch 6th nGreat use installing radio new airplane No need use Tx setup throws etc Radio inpound flying site have engine problem NO problem have ACK-U TROLLER helter product modetee HS N ELECTRONICS iN Power Soar New Heights LT-50 GEAR MOTOR Leisures Gear Drive conversion 31 powerful IT-SO develops up 2 lbs static trhrust Gear Drive also features ball bearing Delrinlbrass gearing glass loaded polycarbonate housing Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspringllrvine/CA 92714 z APPLIED DESIGN CORPORATION 738 Penn SI El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded hIs cur Handy Ia Held Easy Ia Une $225 MINI-STRIPS PRECISION DIE-CUT MedIum Garnet SAVES TIMEREPLACEMENTFine Garnet AND EFFORT $145SANDinG BELTSAmId Waler Praol TEE jji ALUMINUM EXTRUSION SANDING BLOCK hr use 1111 RUFF-STUFF Bell-adhesIve sand peper Large True Serace WeolWeerOuI 11 Inch $250 Haedy Ia Uae 22 inch $365 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAMS Easy Use Ne asessy glue drying lime MediumFlee r Floe $92 M N L5 SAW $650 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw has ragged dIe-coal frame willi cemlrlahle chlp-preel plealle ho ned handle Receding ne aed ad juslable B blade glees Bead work access Cuts weed planlic metal sod HARDENED MUSIC WIRE extra blades-31$199 next generation Aeroncas becaine familiar Chief 50- 65horsepower flat-four engines Conti nental Span Chief remained same wing chord increased 58 considerable addition wing area K destroyed wind storm described tornado hun dred airplanes airport damaged its new hemp ropes torn went over fence inverted Only engine landing gear salvageable engine brought us $100 modelers will know price OS Gemini model engine today Incidence angles hear repeated re quests information about proper inci dence angles wing stabilizer models Longitudinal dihedral angular difference between incidence angles wing stabilizer typically greater full-size airplanes Scale models seems particular ly true aircraft produced 1920-40 era Aeronca K 40 nega tive incidence angie stabilizer lead ing edge lower hinge line combined 20 positive inci dence wing total difference 60 angles measured relative thrust line horizontal fuselage reference line Other examples found Beechcraft 17 series Staggerwings 5140 longitudinal dihedral plus 2140 downthrust Aeronca Champion 4140 Taylorcraft 50 examples fixed stabilizers eleva tor trim tabs sufficiently pro nounced visible actually measuring airplane parked viewed side side view shows thrust line stabilizer parallel wing set positive incidence angle means airplane will fly tail-high built-in downthrust opposite may also true has ridden Boeing 747 knows floor seems slope downward rear flying straight level some airplanes because tail surfaces working disturbed airwing downwash examplethe angular differ ence may exaggerated ef fect always present Others may have adjustable stabilizers minus 50 plus 20 principle angular difference intended promote stability pitch moae nose position disturbed downward direction example speed increases flow air over negatively-set stabilizer increases downward pressure raise nose thereby regain equilibrium reverse true nose raised speed decreases stabilizer down-pressure reduced lower nose stabiliz er set negative angie will stall after positively-set wing has stalled helps maintain control during stall maneuvers such three-point landing speed creases dive beyond design value red-line speed marked airspeed dicator risk stabilizer may fail due downward force especial ly added load suddenly-ap plied up-elevator Yes wire bracing tail surfaces Scale models functional Longitudinal dihedral drag-induc ing element aircraft design Old-time pilots knew trick using slight dive gather speed trimming bit down elevator reduce wings angle attack decrease its induced drag get speed cruise rpm would trim nose-down hold down-elevator ward pressure control wheel stick could somewhat tiring long cross-country flight Too much push began lose altitude paid off airspeed increases five 10mph B-29 pilots making round trip Tinian Japan during WW II used trick conserve fuel could mean safe return base instead ditching club members made trip regularity offered information Scale models can built gular difference equal proto type Because engine weight fullsize airplane may typically constitute / total weight center gravity would forward compared its lo cation normal modeling practice model would need add nose weight compensate lightweight engine alternative fly model constant application down eleva tor imposes load elevator servo resulting abnormal battery drain effect stabilizer would tempting lower tail eleva tor tries raise ensuing high drag condition tab effect pro duces pitch variations speed changes Therefore large angular difference RC Scale models would undesirable because want control contrasted Free Flight Scale models ex cess pitch stability necessary preference decrease angu lar difference about 20 total Aeronca K willingly accept nonscale appearance stabilizer set improper angle Only expert judge aircraft would detect variation scale otherwise spelled cheating Ac tually high-wing aircraft like Aeronca downwash component wing increases effective angular difference Without wind tunnel equipment aerodynamic knowledge make guess amount angle reduction needed prove ourselves guess correct model responds flight should no lack pitch-stability other words cant argue success Paying close attention some popular Scale kits have noted uncommon design feature means can balance model about 25% 30% wing chord aft leading edge preferably shifting 154 Model Aviation Add 20% postage Send 2K catilog batteries rather adding nose weight 25% figure recommended RC Scale models avoid problems tailheaviness old Scale modelers bugaboo inadvertent snap-roll Changing incidence stabilizer will have some effect elevator travel re quirements tail-dragger airplane add bit extra up-elevator travel assure getting tail wheel down runway pretty three-point landing As airspeed diminishes near stall smooth landing elevator becomes progressively less effective full-stall landing Aeronca elevator uptravel 200 Since supposedly non aerobatic ship down-travel inconse quential aerobatic types airplane full-symmetrical airfoil use down up Tailspins also re quire substantial amount up-elevator snap rolls maneuvers 200 up travel may quite enough Since usually include spins ma neuver list performed regu larly K during flight training prefer provide adjustment elevator travel somewhere linkage cer tam sufficient travel K model enters slowly revolving spin com mand stops spinning delay instant controls neutralized Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC AerobaticslVan Putte Continued page 51 about change pace serious Pattern talk Ken Willard will pardon expression something Sunday fli er will understand appreciate Pre pare yourself fall off chair youre sitting following published RF Signal newsletter Isotopes R/C Model Club Owensboro KY edited Ron Epple Although credit ed believe Ron Epple wrote follow ing Building TipsAs lot al ready know am constantly being asked advice building flying large share World-class fliers have now decided share few secrets First open up box new kit turn upside down floor Dont worry pieces will go back in. larger box Find thickest deepest-pile carpet home examine hardware will enable improvise other-size screws bolts later Start building now Dont bother pin wing plans during construc tion method beginners sissies wing may move around lit tle itll okay Pour glue over wing way will sure joint secured Rememberglue cheaper new airplane plane has low wing dont drill holes blocks landing gear now can always after covered MonoKote patches add scale effect fuselageif box type use fine super glues around quickly build two left sides taking left sides apart can admire tenacity instant glues putting engine mount firewall dont bother measure centerline isnt important Dave Brown Hanno Prettner dont own measuring instruments such rule square incidence meter airplanes fly fairly decently because have whistles bells radios Go ahead cover fin stabilizer fuselage before gluing together modern adhesives have day can glue MonoKote Mono Kote smear some glue fin ish tell everyone gave plane weathered look Nows time drill holes engine mount usually just eyeball engine drill away Heres littleknown secretmost top builders fliers like myself never screw engine down right side several reasons position engine mount proceed drill A-in drill doesnt have room right side because dumb exhaust way Also muffler goes right side believe will provide enough weight hold engine down Anyway muffler place can see have side secured anyhow Set pilot figure table next plane Now glue canopy plane After sure epoxy has set up look over pilot still table Can see him smile Never repeat never fuel-proof thing you will violate Law Attrition fuel-proofing plane will eventually limp off somewhere can send check Hazel Sig another kit repeat fun process over again Happy building Isnt beautiful Despite humor vein truth showed through caught us things weve done wed just soon hadnt done doubt escaped unscathed Im going end column some real good ideas pub lished Talespins newsletter Aeromasters Model Alrplane Club Fred ericksburg VA edited Charles Rector authored follow ing Tricks TradeEpoxy glues great things have hap pened modeling recent years youd better doggone sure want something glued because after epoxy has hardened its glued forever really can soften epoxy heat Continued page 158 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 qo * $300 QP * $35009 * $250 qp * * plu shipping source QUIET FLIGHT supplies histarts electric motors& reducers hatt er jes pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit . VISA MASTERCARD bind EY fl EMS CORPORATION ONE WOOD LANEMALVERNPA19355 21S644-06926772 Write call information September 1984 155 C btteo ,ot incluied P OWR TOW C hattsiy inc1d R ZOOM RETRIEVER
Edition: Model Aviation - 1984/09
Page Numbers: 48, 49, 152, 154, 155
Radio Control Scale Bob & Dolly Wischer AERONCA K lives again Forty-three years ago young newlyweds search adventure lure flight became irresistible four-year-old Aeronca K offered sale low price $650 couple Scalemodeling friends K acquired flight training began us investing tremendous sum $217 After 50 hours training Department Commerce flight inspector punctured dream bubble ultimatum get better airplane flight tests reasons Aeroncas two-cylinder engine single ignition absence wheel brakes modeling partners unwilling invest further airplanes made decision continue training Lycoming-powered Taylorcraft another $600 Yes used airplanes cheap 1941 uninflated dollars T-craft four cylinders again single ignition heel-operated wheel brakes nearly useless airplane satisfied inspectors require ments pilots license soon acquired Being avid Scale modelers days now carefully measured made photo records both airplanes Drawings made intention reproducing craft model form ty-three years later quarter-scale ninefoot-span Aeronca K finally finished flying built drawings conjunction Paul Matt Historical Aviation Album Volume 15 remarkable coincidence license number shown Pauls drawings NC19345 airplane Album photos shows parked front hangar Milwaukees Mitchell Field As Scale models K built few pencil linesthere no model construction drawings decision build Aeronca -scale spurred notable similarity OS Gemini 120 twin two-cylinder Aeronca-built engine K Its overall dimensions almost exactly correct Only shaft length seriously out-of-scale being too long scale propeller hub counterbored its back side compensate added length Gemini crankcase disguised sheet aluminum simulate Aeron ca case casting project started Sport Scale airplane could also flown Giant Scale competition its final form can additionally compete FAI Preci sion class airplane its detail quite complete 12 lb well within weight limits Wing loading very reas onable 20 oz per sq ft lightweight Sig Aeroscale wheels have ribbed treads ground off smooth contributes scale ap pearance Grinding done placing wheel shaft lubricate bear ing pressing ribbed tire tread against spinning sanding disc angle tire being slowly revolved excess rubber compound removed trick getting shaft proper angle tire isnt spun too rapidly system permits rapid uniform removal rubber resulting scuffed surface has look tire has seen landings showing genuine wear Aeronca covered Sig Kover heat-shrunk medium setting heat-sealing tool Too much heat can collapse light structure After shrinking Koverall given three coats non tautening butyrate dope two coats color lightweight finish Due its light weight K has very wide speed envelope flight open throttle speed obviously too high Scale realism model will float along loss altitude throttle U Ken Ames modlled Jemco kit %-scaie Douglas SBD-5 Dauntless ww II aive aomoer IL t-inisn acrylic evamei engine 03 90 weight 1175 lb super finish acrylic lacquer over silk dope atop coat K&Batin ep6xy used Dennis Wanns Hawker Sea Fury R %-scaie 77-in-span British carrier fighter weighs 15 lb uses OS 108 FSR power Deibert McGehes Sport Scale Grumman XF5F-1 Skyrocket L exhibited Toledo Power pair HB 40s Other features include operational wing flaps Spring Air retractable landing gear Finish acrylic lacquer documentation imported Poland Larry Gordons Precision Scale PZL P-23 Karas R built British MAP drawings Twenty-pound Polish light bomber Quadra-powered 48 Model Aviation setting just above idle True Scale speed quite readily attained However under windy conditions realism suffers models ground speed varies drastical ly between upwind downwind head ings Ground speed can altered throttle changes During attempted three-point landing strong wind ground speed could near zero crosswind taxiing also quite adven ture can borrow idea Sailplane fellows add some weight CG increase airspeed wind velocity beyond point manage ability bit useful weight could four-ampere Ni-Cd cell on-board glow ignition fuel 2-stroke engines has home-brew mixture methanol 20% castor oil 5% nitromethane Gemini seems thrive ratio would prefer avoid having type fuel various engines Lets pretend engine sounds realistic compared fullsize doesnt Sound different certainly less annoying two-stroke 9000 rpm contrasted 2300 full-size spoils illusion model has approximately 100 brazed silver-soldered aluminumsoldered joints its structure Wing Continued page 152 September 1984 49 Bob Dolly learned fly prototype quarter-scale Aeronca K back 1941 clue can find Precision Scale model l real thing ii blades grass look proportionally too largel Bob built lightIts under 12 lb Structure completely assembled Super Jet cyanoacrylate glue Power OS Gemini 12 cu 4-stroke twin-cylinder engine perfect dimensions model Bob diagulsed OSs exhaust pipe look like prototypes carburetor air Intake pipecomplete simulated air cleanerlcarb heater box Functional shock-strut landing gear brazed assembly steel tubes Right Stufl UampDeii enjoys realism safety System 303 Lectra-Starters beautiful F7F Tiger Cat 422 Main St Dept MA Irwin PA 15642 Phone 412 864-4959 Send $150 today receive fully illustrated catalog BY LEE TAYLOR MAA POUNDER & PRO PHOTOGRAPhER SUPER two-hour long video cumu lative product TEN YEARS active shooting Featuring 165 LB GRUMMAN GOOSE 16 8-17 16 SPRUCE GOOSE MASTERS CHAMPION SHIPS AMA NATIONALS & MORE Recorded VHS Hi-Grade Video Tape $3495 C&EIF eRSIDENTs $3705 It TAC SEND 5A5E P05 DES SEND CREEK 05 MONEY ORDER TO recovery back course plan worked much better year lean towards types record-setting flights its worth passing whatand howthe experts plan Obviously weather biggest fac torjust behind safety Late spring early summer seem provide best odds good lift conditions However outsmart fickle winds Jack company have set up four basic courses direction north east south west. directions would planned grid pattern farmland country roads doesnt include courses other directions farm roads have very little traf fic selected reasons safety Besides low traffic roads sidestep towns planning near perfect May 26 however wind direction could have better Out northwest 10 24 knots quartering tailwind cause course correc tions hoped since lift light throughout flight No long runs made between thermals course required fourteen 900 turns flight work being Declared Distance attempt meant landing take place within 300 meters spot AMA record 500 meters FAI record Starting 1100 am landing 441 pm 5410 flight covered 9147 miles 14729 kilometers new AMA record tentative FAI record AMA record breaks Dale Folkenings 4282 miles set October 1982 Dale Contest Director Jacks flight Nice guy plane used Pegasus plan No 307 Model Aviation August 1980 copy holds current Open Distance record 10412 miles Altitude record 6025 feet now hangs AMA museum flight ran Braidwood IL south Urbana IL Villa Grove May 27 young Brian Isenhart flew stock Aquila using Miller airfoil modification 126 miles set new record Junior category Still feeling good about June 3 Brian set Standard-class Altitude record 3000 feet plane specially-designed fuselage capable carrying Replogle barograph Photos will appear next months column reference AMA model air plane records March1984 see June 1984 issue Model Aviation page 119 Im finally going put snow shovels away Postal contest Back April 1984 col umn results given Pinellas Soaring Associations postal contest An invitation also offered inter ested clubs compete second postal meet Six clubs countries com peted onea contest dif ferent twist As mentioned back April tasks contest would include sixminute Duration spot landing four-lap F3B Speed kicker would both tasks would flown same weight during same round Results Club Southern Soaring Club Brisbane Pinelas White Sheet FSV Versmold Wellington Country South Africa Australia USA England Germany New Zealand Points 26156 25134 23457 20253 19262 9732 club team scored its best five fliers Best Speed time 240 seconds John Lightfoot South Africa John also best individual score four rounds 6127 team Germany flew fly ing wings Bad weather plagued con test two maxes recorded best Speed time 39 seconds Incidently Sean Walbank top British flier contest edits publishes fine magazine called White Sheet Its quarterly Spring 1984 issue crammed over 40 pages flying wing designs Austria Eng land Germany USA years subscription five English pounds its pound well spent Send subscription request Sean Walbank Editor 29 Gardens Acreman St Sherborne Dorset DT9 3PD England youre interested next postal contest write Kale Harden 3184 Brunswick Circle Palm Harbor FL 33563 USA Good Lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 RC ScalelWischers Continued page 49 struts alone made gum hard wood have 24 silver-solder joints fittings Some aluminum soldering done hobby-shop-type tubing 015 wall thickness can bit tricky Too much heat parts fall floor molten globules Too little heat solder will flow desirable fillet Two critical factors determine success brazing aluminum-soldering silver-soldering small model parts flame intensity brazing-rod diameter flame must completely adjustable must held work longer time necessary obtain good flow fillet being formed rod diameter too great heat will needed melt rod heat parts being joined meltdown parts real hazard As mod el size increases have found need brazed joints smaller models used almost have produced lot scrap learning join light metal pieces greatest advantage brazed joints strength available small light parts helps reduce overall model weight 1937 Aeronca K two-place side-by-side trainer sport-type airplane also known Scout followed C-3 Master 1936 used same basic two-cylinder E-l 13C engine built Aeronca earlier models updated 40 45 horspower its final form K became KC four-cylinder Continental A-40 engine K same span chord wing36 ft 50 inas C-3 152 Model AviationContinued page 154 Great footage BEST GIANT SCALE SEAPLANES SPORT FLYING UNUSUAL AIRCRAFT HELICOPTERS & MASTERS SCALE CHAMPIONS AC K-U-TROLL ER 6 Channel Direct Servo Controller Kit PuIe & Fane gate adiuaable Erar NuitvtabIe 06 Nng 0 Psi PuItes Cis-u-TROtLEn Car Entwkuostjaei NiCd SOtno banern Cho vaNS included No need tie up frestuency have pro bleto airplane Plug ACK-U-TROILER aod chech engine elevator ailerons upto 6 Ehan nels Receiver modification rettuired some radios uhinple build simple use five 5 slide pots contrOl 5 channels switch 6th nGreat use installing radio new airplane No need use Tx setup throws etc Radio inpound flying site have engine problem NO problem have ACK-U TROLLER helter product modetee HS N ELECTRONICS iN Power Soar New Heights LT-50 GEAR MOTOR Leisures Gear Drive conversion 31 powerful IT-SO develops up 2 lbs static trhrust Gear Drive also features ball bearing Delrinlbrass gearing glass loaded polycarbonate housing Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspringllrvine/CA 92714 z APPLIED DESIGN CORPORATION 738 Penn SI El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded hIs cur Handy Ia Held Easy Ia Une $225 MINI-STRIPS PRECISION DIE-CUT MedIum Garnet SAVES TIMEREPLACEMENTFine Garnet AND EFFORT $145SANDinG BELTSAmId Waler Praol TEE jji ALUMINUM EXTRUSION SANDING BLOCK hr use 1111 RUFF-STUFF Bell-adhesIve sand peper Large True Serace WeolWeerOuI 11 Inch $250 Haedy Ia Uae 22 inch $365 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAMS Easy Use Ne asessy glue drying lime MediumFlee r Floe $92 M N L5 SAW $650 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw has ragged dIe-coal frame willi cemlrlahle chlp-preel plealle ho ned handle Receding ne aed ad juslable B blade glees Bead work access Cuts weed planlic metal sod HARDENED MUSIC WIRE extra blades-31$199 next generation Aeroncas becaine familiar Chief 50- 65horsepower flat-four engines Conti nental Span Chief remained same wing chord increased 58 considerable addition wing area K destroyed wind storm described tornado hun dred airplanes airport damaged its new hemp ropes torn went over fence inverted Only engine landing gear salvageable engine brought us $100 modelers will know price OS Gemini model engine today Incidence angles hear repeated re quests information about proper inci dence angles wing stabilizer models Longitudinal dihedral angular difference between incidence angles wing stabilizer typically greater full-size airplanes Scale models seems particular ly true aircraft produced 1920-40 era Aeronca K 40 nega tive incidence angie stabilizer lead ing edge lower hinge line combined 20 positive inci dence wing total difference 60 angles measured relative thrust line horizontal fuselage reference line Other examples found Beechcraft 17 series Staggerwings 5140 longitudinal dihedral plus 2140 downthrust Aeronca Champion 4140 Taylorcraft 50 examples fixed stabilizers eleva tor trim tabs sufficiently pro nounced visible actually measuring airplane parked viewed side side view shows thrust line stabilizer parallel wing set positive incidence angle means airplane will fly tail-high built-in downthrust opposite may also true has ridden Boeing 747 knows floor seems slope downward rear flying straight level some airplanes because tail surfaces working disturbed airwing downwash examplethe angular differ ence may exaggerated ef fect always present Others may have adjustable stabilizers minus 50 plus 20 principle angular difference intended promote stability pitch moae nose position disturbed downward direction example speed increases flow air over negatively-set stabilizer increases downward pressure raise nose thereby regain equilibrium reverse true nose raised speed decreases stabilizer down-pressure reduced lower nose stabiliz er set negative angie will stall after positively-set wing has stalled helps maintain control during stall maneuvers such three-point landing speed creases dive beyond design value red-line speed marked airspeed dicator risk stabilizer may fail due downward force especial ly added load suddenly-ap plied up-elevator Yes wire bracing tail surfaces Scale models functional Longitudinal dihedral drag-induc ing element aircraft design Old-time pilots knew trick using slight dive gather speed trimming bit down elevator reduce wings angle attack decrease its induced drag get speed cruise rpm would trim nose-down hold down-elevator ward pressure control wheel stick could somewhat tiring long cross-country flight Too much push began lose altitude paid off airspeed increases five 10mph B-29 pilots making round trip Tinian Japan during WW II used trick conserve fuel could mean safe return base instead ditching club members made trip regularity offered information Scale models can built gular difference equal proto type Because engine weight fullsize airplane may typically constitute / total weight center gravity would forward compared its lo cation normal modeling practice model would need add nose weight compensate lightweight engine alternative fly model constant application down eleva tor imposes load elevator servo resulting abnormal battery drain effect stabilizer would tempting lower tail eleva tor tries raise ensuing high drag condition tab effect pro duces pitch variations speed changes Therefore large angular difference RC Scale models would undesirable because want control contrasted Free Flight Scale models ex cess pitch stability necessary preference decrease angu lar difference about 20 total Aeronca K willingly accept nonscale appearance stabilizer set improper angle Only expert judge aircraft would detect variation scale otherwise spelled cheating Ac tually high-wing aircraft like Aeronca downwash component wing increases effective angular difference Without wind tunnel equipment aerodynamic knowledge make guess amount angle reduction needed prove ourselves guess correct model responds flight should no lack pitch-stability other words cant argue success Paying close attention some popular Scale kits have noted uncommon design feature means can balance model about 25% 30% wing chord aft leading edge preferably shifting 154 Model Aviation Add 20% postage Send 2K catilog batteries rather adding nose weight 25% figure recommended RC Scale models avoid problems tailheaviness old Scale modelers bugaboo inadvertent snap-roll Changing incidence stabilizer will have some effect elevator travel re quirements tail-dragger airplane add bit extra up-elevator travel assure getting tail wheel down runway pretty three-point landing As airspeed diminishes near stall smooth landing elevator becomes progressively less effective full-stall landing Aeronca elevator uptravel 200 Since supposedly non aerobatic ship down-travel inconse quential aerobatic types airplane full-symmetrical airfoil use down up Tailspins also re quire substantial amount up-elevator snap rolls maneuvers 200 up travel may quite enough Since usually include spins ma neuver list performed regu larly K during flight training prefer provide adjustment elevator travel somewhere linkage cer tam sufficient travel K model enters slowly revolving spin com mand stops spinning delay instant controls neutralized Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC AerobaticslVan Putte Continued page 51 about change pace serious Pattern talk Ken Willard will pardon expression something Sunday fli er will understand appreciate Pre pare yourself fall off chair youre sitting following published RF Signal newsletter Isotopes R/C Model Club Owensboro KY edited Ron Epple Although credit ed believe Ron Epple wrote follow ing Building TipsAs lot al ready know am constantly being asked advice building flying large share World-class fliers have now decided share few secrets First open up box new kit turn upside down floor Dont worry pieces will go back in. larger box Find thickest deepest-pile carpet home examine hardware will enable improvise other-size screws bolts later Start building now Dont bother pin wing plans during construc tion method beginners sissies wing may move around lit tle itll okay Pour glue over wing way will sure joint secured Rememberglue cheaper new airplane plane has low wing dont drill holes blocks landing gear now can always after covered MonoKote patches add scale effect fuselageif box type use fine super glues around quickly build two left sides taking left sides apart can admire tenacity instant glues putting engine mount firewall dont bother measure centerline isnt important Dave Brown Hanno Prettner dont own measuring instruments such rule square incidence meter airplanes fly fairly decently because have whistles bells radios Go ahead cover fin stabilizer fuselage before gluing together modern adhesives have day can glue MonoKote Mono Kote smear some glue fin ish tell everyone gave plane weathered look Nows time drill holes engine mount usually just eyeball engine drill away Heres littleknown secretmost top builders fliers like myself never screw engine down right side several reasons position engine mount proceed drill A-in drill doesnt have room right side because dumb exhaust way Also muffler goes right side believe will provide enough weight hold engine down Anyway muffler place can see have side secured anyhow Set pilot figure table next plane Now glue canopy plane After sure epoxy has set up look over pilot still table Can see him smile Never repeat never fuel-proof thing you will violate Law Attrition fuel-proofing plane will eventually limp off somewhere can send check Hazel Sig another kit repeat fun process over again Happy building Isnt beautiful Despite humor vein truth showed through caught us things weve done wed just soon hadnt done doubt escaped unscathed Im going end column some real good ideas pub lished Talespins newsletter Aeromasters Model Alrplane Club Fred ericksburg VA edited Charles Rector authored follow ing Tricks TradeEpoxy glues great things have hap pened modeling recent years youd better doggone sure want something glued because after epoxy has hardened its glued forever really can soften epoxy heat Continued page 158 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 qo * $300 QP * $35009 * $250 qp * * plu shipping source QUIET FLIGHT supplies histarts electric motors& reducers hatt er jes pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit . VISA MASTERCARD bind EY fl EMS CORPORATION ONE WOOD LANEMALVERNPA19355 21S644-06926772 Write call information September 1984 155 C btteo ,ot incluied P OWR TOW C hattsiy inc1d R ZOOM RETRIEVER
Edition: Model Aviation - 1984/09
Page Numbers: 48, 49, 152, 154, 155
Radio Control Scale Bob & Dolly Wischer AERONCA K lives again Forty-three years ago young newlyweds search adventure lure flight became irresistible four-year-old Aeronca K offered sale low price $650 couple Scalemodeling friends K acquired flight training began us investing tremendous sum $217 After 50 hours training Department Commerce flight inspector punctured dream bubble ultimatum get better airplane flight tests reasons Aeroncas two-cylinder engine single ignition absence wheel brakes modeling partners unwilling invest further airplanes made decision continue training Lycoming-powered Taylorcraft another $600 Yes used airplanes cheap 1941 uninflated dollars T-craft four cylinders again single ignition heel-operated wheel brakes nearly useless airplane satisfied inspectors require ments pilots license soon acquired Being avid Scale modelers days now carefully measured made photo records both airplanes Drawings made intention reproducing craft model form ty-three years later quarter-scale ninefoot-span Aeronca K finally finished flying built drawings conjunction Paul Matt Historical Aviation Album Volume 15 remarkable coincidence license number shown Pauls drawings NC19345 airplane Album photos shows parked front hangar Milwaukees Mitchell Field As Scale models K built few pencil linesthere no model construction drawings decision build Aeronca -scale spurred notable similarity OS Gemini 120 twin two-cylinder Aeronca-built engine K Its overall dimensions almost exactly correct Only shaft length seriously out-of-scale being too long scale propeller hub counterbored its back side compensate added length Gemini crankcase disguised sheet aluminum simulate Aeron ca case casting project started Sport Scale airplane could also flown Giant Scale competition its final form can additionally compete FAI Preci sion class airplane its detail quite complete 12 lb well within weight limits Wing loading very reas onable 20 oz per sq ft lightweight Sig Aeroscale wheels have ribbed treads ground off smooth contributes scale ap pearance Grinding done placing wheel shaft lubricate bear ing pressing ribbed tire tread against spinning sanding disc angle tire being slowly revolved excess rubber compound removed trick getting shaft proper angle tire isnt spun too rapidly system permits rapid uniform removal rubber resulting scuffed surface has look tire has seen landings showing genuine wear Aeronca covered Sig Kover heat-shrunk medium setting heat-sealing tool Too much heat can collapse light structure After shrinking Koverall given three coats non tautening butyrate dope two coats color lightweight finish Due its light weight K has very wide speed envelope flight open throttle speed obviously too high Scale realism model will float along loss altitude throttle U Ken Ames modlled Jemco kit %-scaie Douglas SBD-5 Dauntless ww II aive aomoer IL t-inisn acrylic evamei engine 03 90 weight 1175 lb super finish acrylic lacquer over silk dope atop coat K&Batin ep6xy used Dennis Wanns Hawker Sea Fury R %-scaie 77-in-span British carrier fighter weighs 15 lb uses OS 108 FSR power Deibert McGehes Sport Scale Grumman XF5F-1 Skyrocket L exhibited Toledo Power pair HB 40s Other features include operational wing flaps Spring Air retractable landing gear Finish acrylic lacquer documentation imported Poland Larry Gordons Precision Scale PZL P-23 Karas R built British MAP drawings Twenty-pound Polish light bomber Quadra-powered 48 Model Aviation setting just above idle True Scale speed quite readily attained However under windy conditions realism suffers models ground speed varies drastical ly between upwind downwind head ings Ground speed can altered throttle changes During attempted three-point landing strong wind ground speed could near zero crosswind taxiing also quite adven ture can borrow idea Sailplane fellows add some weight CG increase airspeed wind velocity beyond point manage ability bit useful weight could four-ampere Ni-Cd cell on-board glow ignition fuel 2-stroke engines has home-brew mixture methanol 20% castor oil 5% nitromethane Gemini seems thrive ratio would prefer avoid having type fuel various engines Lets pretend engine sounds realistic compared fullsize doesnt Sound different certainly less annoying two-stroke 9000 rpm contrasted 2300 full-size spoils illusion model has approximately 100 brazed silver-soldered aluminumsoldered joints its structure Wing Continued page 152 September 1984 49 Bob Dolly learned fly prototype quarter-scale Aeronca K back 1941 clue can find Precision Scale model l real thing ii blades grass look proportionally too largel Bob built lightIts under 12 lb Structure completely assembled Super Jet cyanoacrylate glue Power OS Gemini 12 cu 4-stroke twin-cylinder engine perfect dimensions model Bob diagulsed OSs exhaust pipe look like prototypes carburetor air Intake pipecomplete simulated air cleanerlcarb heater box Functional shock-strut landing gear brazed assembly steel tubes Right Stufl UampDeii enjoys realism safety System 303 Lectra-Starters beautiful F7F Tiger Cat 422 Main St Dept MA Irwin PA 15642 Phone 412 864-4959 Send $150 today receive fully illustrated catalog BY LEE TAYLOR MAA POUNDER & PRO PHOTOGRAPhER SUPER two-hour long video cumu lative product TEN YEARS active shooting Featuring 165 LB GRUMMAN GOOSE 16 8-17 16 SPRUCE GOOSE MASTERS CHAMPION SHIPS AMA NATIONALS & MORE Recorded VHS Hi-Grade Video Tape $3495 C&EIF eRSIDENTs $3705 It TAC SEND 5A5E P05 DES SEND CREEK 05 MONEY ORDER TO recovery back course plan worked much better year lean towards types record-setting flights its worth passing whatand howthe experts plan Obviously weather biggest fac torjust behind safety Late spring early summer seem provide best odds good lift conditions However outsmart fickle winds Jack company have set up four basic courses direction north east south west. directions would planned grid pattern farmland country roads doesnt include courses other directions farm roads have very little traf fic selected reasons safety Besides low traffic roads sidestep towns planning near perfect May 26 however wind direction could have better Out northwest 10 24 knots quartering tailwind cause course correc tions hoped since lift light throughout flight No long runs made between thermals course required fourteen 900 turns flight work being Declared Distance attempt meant landing take place within 300 meters spot AMA record 500 meters FAI record Starting 1100 am landing 441 pm 5410 flight covered 9147 miles 14729 kilometers new AMA record tentative FAI record AMA record breaks Dale Folkenings 4282 miles set October 1982 Dale Contest Director Jacks flight Nice guy plane used Pegasus plan No 307 Model Aviation August 1980 copy holds current Open Distance record 10412 miles Altitude record 6025 feet now hangs AMA museum flight ran Braidwood IL south Urbana IL Villa Grove May 27 young Brian Isenhart flew stock Aquila using Miller airfoil modification 126 miles set new record Junior category Still feeling good about June 3 Brian set Standard-class Altitude record 3000 feet plane specially-designed fuselage capable carrying Replogle barograph Photos will appear next months column reference AMA model air plane records March1984 see June 1984 issue Model Aviation page 119 Im finally going put snow shovels away Postal contest Back April 1984 col umn results given Pinellas Soaring Associations postal contest An invitation also offered inter ested clubs compete second postal meet Six clubs countries com peted onea contest dif ferent twist As mentioned back April tasks contest would include sixminute Duration spot landing four-lap F3B Speed kicker would both tasks would flown same weight during same round Results Club Southern Soaring Club Brisbane Pinelas White Sheet FSV Versmold Wellington Country South Africa Australia USA England Germany New Zealand Points 26156 25134 23457 20253 19262 9732 club team scored its best five fliers Best Speed time 240 seconds John Lightfoot South Africa John also best individual score four rounds 6127 team Germany flew fly ing wings Bad weather plagued con test two maxes recorded best Speed time 39 seconds Incidently Sean Walbank top British flier contest edits publishes fine magazine called White Sheet Its quarterly Spring 1984 issue crammed over 40 pages flying wing designs Austria Eng land Germany USA years subscription five English pounds its pound well spent Send subscription request Sean Walbank Editor 29 Gardens Acreman St Sherborne Dorset DT9 3PD England youre interested next postal contest write Kale Harden 3184 Brunswick Circle Palm Harbor FL 33563 USA Good Lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 RC ScalelWischers Continued page 49 struts alone made gum hard wood have 24 silver-solder joints fittings Some aluminum soldering done hobby-shop-type tubing 015 wall thickness can bit tricky Too much heat parts fall floor molten globules Too little heat solder will flow desirable fillet Two critical factors determine success brazing aluminum-soldering silver-soldering small model parts flame intensity brazing-rod diameter flame must completely adjustable must held work longer time necessary obtain good flow fillet being formed rod diameter too great heat will needed melt rod heat parts being joined meltdown parts real hazard As mod el size increases have found need brazed joints smaller models used almost have produced lot scrap learning join light metal pieces greatest advantage brazed joints strength available small light parts helps reduce overall model weight 1937 Aeronca K two-place side-by-side trainer sport-type airplane also known Scout followed C-3 Master 1936 used same basic two-cylinder E-l 13C engine built Aeronca earlier models updated 40 45 horspower its final form K became KC four-cylinder Continental A-40 engine K same span chord wing36 ft 50 inas C-3 152 Model AviationContinued page 154 Great footage BEST GIANT SCALE SEAPLANES SPORT FLYING UNUSUAL AIRCRAFT HELICOPTERS & MASTERS SCALE CHAMPIONS AC K-U-TROLL ER 6 Channel Direct Servo Controller Kit PuIe & Fane gate adiuaable Erar NuitvtabIe 06 Nng 0 Psi PuItes Cis-u-TROtLEn Car Entwkuostjaei NiCd SOtno banern Cho vaNS included No need tie up frestuency have pro bleto airplane Plug ACK-U-TROILER aod chech engine elevator ailerons upto 6 Ehan nels Receiver modification rettuired some radios uhinple build simple use five 5 slide pots contrOl 5 channels switch 6th nGreat use installing radio new airplane No need use Tx setup throws etc Radio inpound flying site have engine problem NO problem have ACK-U TROLLER helter product modetee HS N ELECTRONICS iN Power Soar New Heights LT-50 GEAR MOTOR Leisures Gear Drive conversion 31 powerful IT-SO develops up 2 lbs static trhrust Gear Drive also features ball bearing Delrinlbrass gearing glass loaded polycarbonate housing Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspringllrvine/CA 92714 z APPLIED DESIGN CORPORATION 738 Penn SI El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded hIs cur Handy Ia Held Easy Ia Une $225 MINI-STRIPS PRECISION DIE-CUT MedIum Garnet SAVES TIMEREPLACEMENTFine Garnet AND EFFORT $145SANDinG BELTSAmId Waler Praol TEE jji ALUMINUM EXTRUSION SANDING BLOCK hr use 1111 RUFF-STUFF Bell-adhesIve sand peper Large True Serace WeolWeerOuI 11 Inch $250 Haedy Ia Uae 22 inch $365 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAMS Easy Use Ne asessy glue drying lime MediumFlee r Floe $92 M N L5 SAW $650 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw has ragged dIe-coal frame willi cemlrlahle chlp-preel plealle ho ned handle Receding ne aed ad juslable B blade glees Bead work access Cuts weed planlic metal sod HARDENED MUSIC WIRE extra blades-31$199 next generation Aeroncas becaine familiar Chief 50- 65horsepower flat-four engines Conti nental Span Chief remained same wing chord increased 58 considerable addition wing area K destroyed wind storm described tornado hun dred airplanes airport damaged its new hemp ropes torn went over fence inverted Only engine landing gear salvageable engine brought us $100 modelers will know price OS Gemini model engine today Incidence angles hear repeated re quests information about proper inci dence angles wing stabilizer models Longitudinal dihedral angular difference between incidence angles wing stabilizer typically greater full-size airplanes Scale models seems particular ly true aircraft produced 1920-40 era Aeronca K 40 nega tive incidence angie stabilizer lead ing edge lower hinge line combined 20 positive inci dence wing total difference 60 angles measured relative thrust line horizontal fuselage reference line Other examples found Beechcraft 17 series Staggerwings 5140 longitudinal dihedral plus 2140 downthrust Aeronca Champion 4140 Taylorcraft 50 examples fixed stabilizers eleva tor trim tabs sufficiently pro nounced visible actually measuring airplane parked viewed side side view shows thrust line stabilizer parallel wing set positive incidence angle means airplane will fly tail-high built-in downthrust opposite may also true has ridden Boeing 747 knows floor seems slope downward rear flying straight level some airplanes because tail surfaces working disturbed airwing downwash examplethe angular differ ence may exaggerated ef fect always present Others may have adjustable stabilizers minus 50 plus 20 principle angular difference intended promote stability pitch moae nose position disturbed downward direction example speed increases flow air over negatively-set stabilizer increases downward pressure raise nose thereby regain equilibrium reverse true nose raised speed decreases stabilizer down-pressure reduced lower nose stabiliz er set negative angie will stall after positively-set wing has stalled helps maintain control during stall maneuvers such three-point landing speed creases dive beyond design value red-line speed marked airspeed dicator risk stabilizer may fail due downward force especial ly added load suddenly-ap plied up-elevator Yes wire bracing tail surfaces Scale models functional Longitudinal dihedral drag-induc ing element aircraft design Old-time pilots knew trick using slight dive gather speed trimming bit down elevator reduce wings angle attack decrease its induced drag get speed cruise rpm would trim nose-down hold down-elevator ward pressure control wheel stick could somewhat tiring long cross-country flight Too much push began lose altitude paid off airspeed increases five 10mph B-29 pilots making round trip Tinian Japan during WW II used trick conserve fuel could mean safe return base instead ditching club members made trip regularity offered information Scale models can built gular difference equal proto type Because engine weight fullsize airplane may typically constitute / total weight center gravity would forward compared its lo cation normal modeling practice model would need add nose weight compensate lightweight engine alternative fly model constant application down eleva tor imposes load elevator servo resulting abnormal battery drain effect stabilizer would tempting lower tail eleva tor tries raise ensuing high drag condition tab effect pro duces pitch variations speed changes Therefore large angular difference RC Scale models would undesirable because want control contrasted Free Flight Scale models ex cess pitch stability necessary preference decrease angu lar difference about 20 total Aeronca K willingly accept nonscale appearance stabilizer set improper angle Only expert judge aircraft would detect variation scale otherwise spelled cheating Ac tually high-wing aircraft like Aeronca downwash component wing increases effective angular difference Without wind tunnel equipment aerodynamic knowledge make guess amount angle reduction needed prove ourselves guess correct model responds flight should no lack pitch-stability other words cant argue success Paying close attention some popular Scale kits have noted uncommon design feature means can balance model about 25% 30% wing chord aft leading edge preferably shifting 154 Model Aviation Add 20% postage Send 2K catilog batteries rather adding nose weight 25% figure recommended RC Scale models avoid problems tailheaviness old Scale modelers bugaboo inadvertent snap-roll Changing incidence stabilizer will have some effect elevator travel re quirements tail-dragger airplane add bit extra up-elevator travel assure getting tail wheel down runway pretty three-point landing As airspeed diminishes near stall smooth landing elevator becomes progressively less effective full-stall landing Aeronca elevator uptravel 200 Since supposedly non aerobatic ship down-travel inconse quential aerobatic types airplane full-symmetrical airfoil use down up Tailspins also re quire substantial amount up-elevator snap rolls maneuvers 200 up travel may quite enough Since usually include spins ma neuver list performed regu larly K during flight training prefer provide adjustment elevator travel somewhere linkage cer tam sufficient travel K model enters slowly revolving spin com mand stops spinning delay instant controls neutralized Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC AerobaticslVan Putte Continued page 51 about change pace serious Pattern talk Ken Willard will pardon expression something Sunday fli er will understand appreciate Pre pare yourself fall off chair youre sitting following published RF Signal newsletter Isotopes R/C Model Club Owensboro KY edited Ron Epple Although credit ed believe Ron Epple wrote follow ing Building TipsAs lot al ready know am constantly being asked advice building flying large share World-class fliers have now decided share few secrets First open up box new kit turn upside down floor Dont worry pieces will go back in. larger box Find thickest deepest-pile carpet home examine hardware will enable improvise other-size screws bolts later Start building now Dont bother pin wing plans during construc tion method beginners sissies wing may move around lit tle itll okay Pour glue over wing way will sure joint secured Rememberglue cheaper new airplane plane has low wing dont drill holes blocks landing gear now can always after covered MonoKote patches add scale effect fuselageif box type use fine super glues around quickly build two left sides taking left sides apart can admire tenacity instant glues putting engine mount firewall dont bother measure centerline isnt important Dave Brown Hanno Prettner dont own measuring instruments such rule square incidence meter airplanes fly fairly decently because have whistles bells radios Go ahead cover fin stabilizer fuselage before gluing together modern adhesives have day can glue MonoKote Mono Kote smear some glue fin ish tell everyone gave plane weathered look Nows time drill holes engine mount usually just eyeball engine drill away Heres littleknown secretmost top builders fliers like myself never screw engine down right side several reasons position engine mount proceed drill A-in drill doesnt have room right side because dumb exhaust way Also muffler goes right side believe will provide enough weight hold engine down Anyway muffler place can see have side secured anyhow Set pilot figure table next plane Now glue canopy plane After sure epoxy has set up look over pilot still table Can see him smile Never repeat never fuel-proof thing you will violate Law Attrition fuel-proofing plane will eventually limp off somewhere can send check Hazel Sig another kit repeat fun process over again Happy building Isnt beautiful Despite humor vein truth showed through caught us things weve done wed just soon hadnt done doubt escaped unscathed Im going end column some real good ideas pub lished Talespins newsletter Aeromasters Model Alrplane Club Fred ericksburg VA edited Charles Rector authored follow ing Tricks TradeEpoxy glues great things have hap pened modeling recent years youd better doggone sure want something glued because after epoxy has hardened its glued forever really can soften epoxy heat Continued page 158 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 qo * $300 QP * $35009 * $250 qp * * plu shipping source QUIET FLIGHT supplies histarts electric motors& reducers hatt er jes pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit . VISA MASTERCARD bind EY fl EMS CORPORATION ONE WOOD LANEMALVERNPA19355 21S644-06926772 Write call information September 1984 155 C btteo ,ot incluied P OWR TOW C hattsiy inc1d R ZOOM RETRIEVER
Edition: Model Aviation - 1984/09
Page Numbers: 48, 49, 152, 154, 155
Radio Control Scale Bob & Dolly Wischer AERONCA K lives again Forty-three years ago young newlyweds search adventure lure flight became irresistible four-year-old Aeronca K offered sale low price $650 couple Scalemodeling friends K acquired flight training began us investing tremendous sum $217 After 50 hours training Department Commerce flight inspector punctured dream bubble ultimatum get better airplane flight tests reasons Aeroncas two-cylinder engine single ignition absence wheel brakes modeling partners unwilling invest further airplanes made decision continue training Lycoming-powered Taylorcraft another $600 Yes used airplanes cheap 1941 uninflated dollars T-craft four cylinders again single ignition heel-operated wheel brakes nearly useless airplane satisfied inspectors require ments pilots license soon acquired Being avid Scale modelers days now carefully measured made photo records both airplanes Drawings made intention reproducing craft model form ty-three years later quarter-scale ninefoot-span Aeronca K finally finished flying built drawings conjunction Paul Matt Historical Aviation Album Volume 15 remarkable coincidence license number shown Pauls drawings NC19345 airplane Album photos shows parked front hangar Milwaukees Mitchell Field As Scale models K built few pencil linesthere no model construction drawings decision build Aeronca -scale spurred notable similarity OS Gemini 120 twin two-cylinder Aeronca-built engine K Its overall dimensions almost exactly correct Only shaft length seriously out-of-scale being too long scale propeller hub counterbored its back side compensate added length Gemini crankcase disguised sheet aluminum simulate Aeron ca case casting project started Sport Scale airplane could also flown Giant Scale competition its final form can additionally compete FAI Preci sion class airplane its detail quite complete 12 lb well within weight limits Wing loading very reas onable 20 oz per sq ft lightweight Sig Aeroscale wheels have ribbed treads ground off smooth contributes scale ap pearance Grinding done placing wheel shaft lubricate bear ing pressing ribbed tire tread against spinning sanding disc angle tire being slowly revolved excess rubber compound removed trick getting shaft proper angle tire isnt spun too rapidly system permits rapid uniform removal rubber resulting scuffed surface has look tire has seen landings showing genuine wear Aeronca covered Sig Kover heat-shrunk medium setting heat-sealing tool Too much heat can collapse light structure After shrinking Koverall given three coats non tautening butyrate dope two coats color lightweight finish Due its light weight K has very wide speed envelope flight open throttle speed obviously too high Scale realism model will float along loss altitude throttle U Ken Ames modlled Jemco kit %-scaie Douglas SBD-5 Dauntless ww II aive aomoer IL t-inisn acrylic evamei engine 03 90 weight 1175 lb super finish acrylic lacquer over silk dope atop coat K&Batin ep6xy used Dennis Wanns Hawker Sea Fury R %-scaie 77-in-span British carrier fighter weighs 15 lb uses OS 108 FSR power Deibert McGehes Sport Scale Grumman XF5F-1 Skyrocket L exhibited Toledo Power pair HB 40s Other features include operational wing flaps Spring Air retractable landing gear Finish acrylic lacquer documentation imported Poland Larry Gordons Precision Scale PZL P-23 Karas R built British MAP drawings Twenty-pound Polish light bomber Quadra-powered 48 Model Aviation setting just above idle True Scale speed quite readily attained However under windy conditions realism suffers models ground speed varies drastical ly between upwind downwind head ings Ground speed can altered throttle changes During attempted three-point landing strong wind ground speed could near zero crosswind taxiing also quite adven ture can borrow idea Sailplane fellows add some weight CG increase airspeed wind velocity beyond point manage ability bit useful weight could four-ampere Ni-Cd cell on-board glow ignition fuel 2-stroke engines has home-brew mixture methanol 20% castor oil 5% nitromethane Gemini seems thrive ratio would prefer avoid having type fuel various engines Lets pretend engine sounds realistic compared fullsize doesnt Sound different certainly less annoying two-stroke 9000 rpm contrasted 2300 full-size spoils illusion model has approximately 100 brazed silver-soldered aluminumsoldered joints its structure Wing Continued page 152 September 1984 49 Bob Dolly learned fly prototype quarter-scale Aeronca K back 1941 clue can find Precision Scale model l real thing ii blades grass look proportionally too largel Bob built lightIts under 12 lb Structure completely assembled Super Jet cyanoacrylate glue Power OS Gemini 12 cu 4-stroke twin-cylinder engine perfect dimensions model Bob diagulsed OSs exhaust pipe look like prototypes carburetor air Intake pipecomplete simulated air cleanerlcarb heater box Functional shock-strut landing gear brazed assembly steel tubes Right Stufl UampDeii enjoys realism safety System 303 Lectra-Starters beautiful F7F Tiger Cat 422 Main St Dept MA Irwin PA 15642 Phone 412 864-4959 Send $150 today receive fully illustrated catalog BY LEE TAYLOR MAA POUNDER & PRO PHOTOGRAPhER SUPER two-hour long video cumu lative product TEN YEARS active shooting Featuring 165 LB GRUMMAN GOOSE 16 8-17 16 SPRUCE GOOSE MASTERS CHAMPION SHIPS AMA NATIONALS & MORE Recorded VHS Hi-Grade Video Tape $3495 C&EIF eRSIDENTs $3705 It TAC SEND 5A5E P05 DES SEND CREEK 05 MONEY ORDER TO recovery back course plan worked much better year lean towards types record-setting flights its worth passing whatand howthe experts plan Obviously weather biggest fac torjust behind safety Late spring early summer seem provide best odds good lift conditions However outsmart fickle winds Jack company have set up four basic courses direction north east south west. directions would planned grid pattern farmland country roads doesnt include courses other directions farm roads have very little traf fic selected reasons safety Besides low traffic roads sidestep towns planning near perfect May 26 however wind direction could have better Out northwest 10 24 knots quartering tailwind cause course correc tions hoped since lift light throughout flight No long runs made between thermals course required fourteen 900 turns flight work being Declared Distance attempt meant landing take place within 300 meters spot AMA record 500 meters FAI record Starting 1100 am landing 441 pm 5410 flight covered 9147 miles 14729 kilometers new AMA record tentative FAI record AMA record breaks Dale Folkenings 4282 miles set October 1982 Dale Contest Director Jacks flight Nice guy plane used Pegasus plan No 307 Model Aviation August 1980 copy holds current Open Distance record 10412 miles Altitude record 6025 feet now hangs AMA museum flight ran Braidwood IL south Urbana IL Villa Grove May 27 young Brian Isenhart flew stock Aquila using Miller airfoil modification 126 miles set new record Junior category Still feeling good about June 3 Brian set Standard-class Altitude record 3000 feet plane specially-designed fuselage capable carrying Replogle barograph Photos will appear next months column reference AMA model air plane records March1984 see June 1984 issue Model Aviation page 119 Im finally going put snow shovels away Postal contest Back April 1984 col umn results given Pinellas Soaring Associations postal contest An invitation also offered inter ested clubs compete second postal meet Six clubs countries com peted onea contest dif ferent twist As mentioned back April tasks contest would include sixminute Duration spot landing four-lap F3B Speed kicker would both tasks would flown same weight during same round Results Club Southern Soaring Club Brisbane Pinelas White Sheet FSV Versmold Wellington Country South Africa Australia USA England Germany New Zealand Points 26156 25134 23457 20253 19262 9732 club team scored its best five fliers Best Speed time 240 seconds John Lightfoot South Africa John also best individual score four rounds 6127 team Germany flew fly ing wings Bad weather plagued con test two maxes recorded best Speed time 39 seconds Incidently Sean Walbank top British flier contest edits publishes fine magazine called White Sheet Its quarterly Spring 1984 issue crammed over 40 pages flying wing designs Austria Eng land Germany USA years subscription five English pounds its pound well spent Send subscription request Sean Walbank Editor 29 Gardens Acreman St Sherborne Dorset DT9 3PD England youre interested next postal contest write Kale Harden 3184 Brunswick Circle Palm Harbor FL 33563 USA Good Lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 RC ScalelWischers Continued page 49 struts alone made gum hard wood have 24 silver-solder joints fittings Some aluminum soldering done hobby-shop-type tubing 015 wall thickness can bit tricky Too much heat parts fall floor molten globules Too little heat solder will flow desirable fillet Two critical factors determine success brazing aluminum-soldering silver-soldering small model parts flame intensity brazing-rod diameter flame must completely adjustable must held work longer time necessary obtain good flow fillet being formed rod diameter too great heat will needed melt rod heat parts being joined meltdown parts real hazard As mod el size increases have found need brazed joints smaller models used almost have produced lot scrap learning join light metal pieces greatest advantage brazed joints strength available small light parts helps reduce overall model weight 1937 Aeronca K two-place side-by-side trainer sport-type airplane also known Scout followed C-3 Master 1936 used same basic two-cylinder E-l 13C engine built Aeronca earlier models updated 40 45 horspower its final form K became KC four-cylinder Continental A-40 engine K same span chord wing36 ft 50 inas C-3 152 Model AviationContinued page 154 Great footage BEST GIANT SCALE SEAPLANES SPORT FLYING UNUSUAL AIRCRAFT HELICOPTERS & MASTERS SCALE CHAMPIONS AC K-U-TROLL ER 6 Channel Direct Servo Controller Kit PuIe & Fane gate adiuaable Erar NuitvtabIe 06 Nng 0 Psi PuItes Cis-u-TROtLEn Car Entwkuostjaei NiCd SOtno banern Cho vaNS included No need tie up frestuency have pro bleto airplane Plug ACK-U-TROILER aod chech engine elevator ailerons upto 6 Ehan nels Receiver modification rettuired some radios uhinple build simple use five 5 slide pots contrOl 5 channels switch 6th nGreat use installing radio new airplane No need use Tx setup throws etc Radio inpound flying site have engine problem NO problem have ACK-U TROLLER helter product modetee HS N ELECTRONICS iN Power Soar New Heights LT-50 GEAR MOTOR Leisures Gear Drive conversion 31 powerful IT-SO develops up 2 lbs static trhrust Gear Drive also features ball bearing Delrinlbrass gearing glass loaded polycarbonate housing Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspringllrvine/CA 92714 z APPLIED DESIGN CORPORATION 738 Penn SI El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded hIs cur Handy Ia Held Easy Ia Une $225 MINI-STRIPS PRECISION DIE-CUT MedIum Garnet SAVES TIMEREPLACEMENTFine Garnet AND EFFORT $145SANDinG BELTSAmId Waler Praol TEE jji ALUMINUM EXTRUSION SANDING BLOCK hr use 1111 RUFF-STUFF Bell-adhesIve sand peper Large True Serace WeolWeerOuI 11 Inch $250 Haedy Ia Uae 22 inch $365 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAMS Easy Use Ne asessy glue drying lime MediumFlee r Floe $92 M N L5 SAW $650 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw has ragged dIe-coal frame willi cemlrlahle chlp-preel plealle ho ned handle Receding ne aed ad juslable B blade glees Bead work access Cuts weed planlic metal sod HARDENED MUSIC WIRE extra blades-31$199 next generation Aeroncas becaine familiar Chief 50- 65horsepower flat-four engines Conti nental Span Chief remained same wing chord increased 58 considerable addition wing area K destroyed wind storm described tornado hun dred airplanes airport damaged its new hemp ropes torn went over fence inverted Only engine landing gear salvageable engine brought us $100 modelers will know price OS Gemini model engine today Incidence angles hear repeated re quests information about proper inci dence angles wing stabilizer models Longitudinal dihedral angular difference between incidence angles wing stabilizer typically greater full-size airplanes Scale models seems particular ly true aircraft produced 1920-40 era Aeronca K 40 nega tive incidence angie stabilizer lead ing edge lower hinge line combined 20 positive inci dence wing total difference 60 angles measured relative thrust line horizontal fuselage reference line Other examples found Beechcraft 17 series Staggerwings 5140 longitudinal dihedral plus 2140 downthrust Aeronca Champion 4140 Taylorcraft 50 examples fixed stabilizers eleva tor trim tabs sufficiently pro nounced visible actually measuring airplane parked viewed side side view shows thrust line stabilizer parallel wing set positive incidence angle means airplane will fly tail-high built-in downthrust opposite may also true has ridden Boeing 747 knows floor seems slope downward rear flying straight level some airplanes because tail surfaces working disturbed airwing downwash examplethe angular differ ence may exaggerated ef fect always present Others may have adjustable stabilizers minus 50 plus 20 principle angular difference intended promote stability pitch moae nose position disturbed downward direction example speed increases flow air over negatively-set stabilizer increases downward pressure raise nose thereby regain equilibrium reverse true nose raised speed decreases stabilizer down-pressure reduced lower nose stabiliz er set negative angie will stall after positively-set wing has stalled helps maintain control during stall maneuvers such three-point landing speed creases dive beyond design value red-line speed marked airspeed dicator risk stabilizer may fail due downward force especial ly added load suddenly-ap plied up-elevator Yes wire bracing tail surfaces Scale models functional Longitudinal dihedral drag-induc ing element aircraft design Old-time pilots knew trick using slight dive gather speed trimming bit down elevator reduce wings angle attack decrease its induced drag get speed cruise rpm would trim nose-down hold down-elevator ward pressure control wheel stick could somewhat tiring long cross-country flight Too much push began lose altitude paid off airspeed increases five 10mph B-29 pilots making round trip Tinian Japan during WW II used trick conserve fuel could mean safe return base instead ditching club members made trip regularity offered information Scale models can built gular difference equal proto type Because engine weight fullsize airplane may typically constitute / total weight center gravity would forward compared its lo cation normal modeling practice model would need add nose weight compensate lightweight engine alternative fly model constant application down eleva tor imposes load elevator servo resulting abnormal battery drain effect stabilizer would tempting lower tail eleva tor tries raise ensuing high drag condition tab effect pro duces pitch variations speed changes Therefore large angular difference RC Scale models would undesirable because want control contrasted Free Flight Scale models ex cess pitch stability necessary preference decrease angu lar difference about 20 total Aeronca K willingly accept nonscale appearance stabilizer set improper angle Only expert judge aircraft would detect variation scale otherwise spelled cheating Ac tually high-wing aircraft like Aeronca downwash component wing increases effective angular difference Without wind tunnel equipment aerodynamic knowledge make guess amount angle reduction needed prove ourselves guess correct model responds flight should no lack pitch-stability other words cant argue success Paying close attention some popular Scale kits have noted uncommon design feature means can balance model about 25% 30% wing chord aft leading edge preferably shifting 154 Model Aviation Add 20% postage Send 2K catilog batteries rather adding nose weight 25% figure recommended RC Scale models avoid problems tailheaviness old Scale modelers bugaboo inadvertent snap-roll Changing incidence stabilizer will have some effect elevator travel re quirements tail-dragger airplane add bit extra up-elevator travel assure getting tail wheel down runway pretty three-point landing As airspeed diminishes near stall smooth landing elevator becomes progressively less effective full-stall landing Aeronca elevator uptravel 200 Since supposedly non aerobatic ship down-travel inconse quential aerobatic types airplane full-symmetrical airfoil use down up Tailspins also re quire substantial amount up-elevator snap rolls maneuvers 200 up travel may quite enough Since usually include spins ma neuver list performed regu larly K during flight training prefer provide adjustment elevator travel somewhere linkage cer tam sufficient travel K model enters slowly revolving spin com mand stops spinning delay instant controls neutralized Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC AerobaticslVan Putte Continued page 51 about change pace serious Pattern talk Ken Willard will pardon expression something Sunday fli er will understand appreciate Pre pare yourself fall off chair youre sitting following published RF Signal newsletter Isotopes R/C Model Club Owensboro KY edited Ron Epple Although credit ed believe Ron Epple wrote follow ing Building TipsAs lot al ready know am constantly being asked advice building flying large share World-class fliers have now decided share few secrets First open up box new kit turn upside down floor Dont worry pieces will go back in. larger box Find thickest deepest-pile carpet home examine hardware will enable improvise other-size screws bolts later Start building now Dont bother pin wing plans during construc tion method beginners sissies wing may move around lit tle itll okay Pour glue over wing way will sure joint secured Rememberglue cheaper new airplane plane has low wing dont drill holes blocks landing gear now can always after covered MonoKote patches add scale effect fuselageif box type use fine super glues around quickly build two left sides taking left sides apart can admire tenacity instant glues putting engine mount firewall dont bother measure centerline isnt important Dave Brown Hanno Prettner dont own measuring instruments such rule square incidence meter airplanes fly fairly decently because have whistles bells radios Go ahead cover fin stabilizer fuselage before gluing together modern adhesives have day can glue MonoKote Mono Kote smear some glue fin ish tell everyone gave plane weathered look Nows time drill holes engine mount usually just eyeball engine drill away Heres littleknown secretmost top builders fliers like myself never screw engine down right side several reasons position engine mount proceed drill A-in drill doesnt have room right side because dumb exhaust way Also muffler goes right side believe will provide enough weight hold engine down Anyway muffler place can see have side secured anyhow Set pilot figure table next plane Now glue canopy plane After sure epoxy has set up look over pilot still table Can see him smile Never repeat never fuel-proof thing you will violate Law Attrition fuel-proofing plane will eventually limp off somewhere can send check Hazel Sig another kit repeat fun process over again Happy building Isnt beautiful Despite humor vein truth showed through caught us things weve done wed just soon hadnt done doubt escaped unscathed Im going end column some real good ideas pub lished Talespins newsletter Aeromasters Model Alrplane Club Fred ericksburg VA edited Charles Rector authored follow ing Tricks TradeEpoxy glues great things have hap pened modeling recent years youd better doggone sure want something glued because after epoxy has hardened its glued forever really can soften epoxy heat Continued page 158 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 qo * $300 QP * $35009 * $250 qp * * plu shipping source QUIET FLIGHT supplies histarts electric motors& reducers hatt er jes pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit . VISA MASTERCARD bind EY fl EMS CORPORATION ONE WOOD LANEMALVERNPA19355 21S644-06926772 Write call information September 1984 155 C btteo ,ot incluied P OWR TOW C hattsiy inc1d R ZOOM RETRIEVER
Edition: Model Aviation - 1984/09
Page Numbers: 48, 49, 152, 154, 155
Radio Control Scale Bob & Dolly Wischer AERONCA K lives again Forty-three years ago young newlyweds search adventure lure flight became irresistible four-year-old Aeronca K offered sale low price $650 couple Scalemodeling friends K acquired flight training began us investing tremendous sum $217 After 50 hours training Department Commerce flight inspector punctured dream bubble ultimatum get better airplane flight tests reasons Aeroncas two-cylinder engine single ignition absence wheel brakes modeling partners unwilling invest further airplanes made decision continue training Lycoming-powered Taylorcraft another $600 Yes used airplanes cheap 1941 uninflated dollars T-craft four cylinders again single ignition heel-operated wheel brakes nearly useless airplane satisfied inspectors require ments pilots license soon acquired Being avid Scale modelers days now carefully measured made photo records both airplanes Drawings made intention reproducing craft model form ty-three years later quarter-scale ninefoot-span Aeronca K finally finished flying built drawings conjunction Paul Matt Historical Aviation Album Volume 15 remarkable coincidence license number shown Pauls drawings NC19345 airplane Album photos shows parked front hangar Milwaukees Mitchell Field As Scale models K built few pencil linesthere no model construction drawings decision build Aeronca -scale spurred notable similarity OS Gemini 120 twin two-cylinder Aeronca-built engine K Its overall dimensions almost exactly correct Only shaft length seriously out-of-scale being too long scale propeller hub counterbored its back side compensate added length Gemini crankcase disguised sheet aluminum simulate Aeron ca case casting project started Sport Scale airplane could also flown Giant Scale competition its final form can additionally compete FAI Preci sion class airplane its detail quite complete 12 lb well within weight limits Wing loading very reas onable 20 oz per sq ft lightweight Sig Aeroscale wheels have ribbed treads ground off smooth contributes scale ap pearance Grinding done placing wheel shaft lubricate bear ing pressing ribbed tire tread against spinning sanding disc angle tire being slowly revolved excess rubber compound removed trick getting shaft proper angle tire isnt spun too rapidly system permits rapid uniform removal rubber resulting scuffed surface has look tire has seen landings showing genuine wear Aeronca covered Sig Kover heat-shrunk medium setting heat-sealing tool Too much heat can collapse light structure After shrinking Koverall given three coats non tautening butyrate dope two coats color lightweight finish Due its light weight K has very wide speed envelope flight open throttle speed obviously too high Scale realism model will float along loss altitude throttle U Ken Ames modlled Jemco kit %-scaie Douglas SBD-5 Dauntless ww II aive aomoer IL t-inisn acrylic evamei engine 03 90 weight 1175 lb super finish acrylic lacquer over silk dope atop coat K&Batin ep6xy used Dennis Wanns Hawker Sea Fury R %-scaie 77-in-span British carrier fighter weighs 15 lb uses OS 108 FSR power Deibert McGehes Sport Scale Grumman XF5F-1 Skyrocket L exhibited Toledo Power pair HB 40s Other features include operational wing flaps Spring Air retractable landing gear Finish acrylic lacquer documentation imported Poland Larry Gordons Precision Scale PZL P-23 Karas R built British MAP drawings Twenty-pound Polish light bomber Quadra-powered 48 Model Aviation setting just above idle True Scale speed quite readily attained However under windy conditions realism suffers models ground speed varies drastical ly between upwind downwind head ings Ground speed can altered throttle changes During attempted three-point landing strong wind ground speed could near zero crosswind taxiing also quite adven ture can borrow idea Sailplane fellows add some weight CG increase airspeed wind velocity beyond point manage ability bit useful weight could four-ampere Ni-Cd cell on-board glow ignition fuel 2-stroke engines has home-brew mixture methanol 20% castor oil 5% nitromethane Gemini seems thrive ratio would prefer avoid having type fuel various engines Lets pretend engine sounds realistic compared fullsize doesnt Sound different certainly less annoying two-stroke 9000 rpm contrasted 2300 full-size spoils illusion model has approximately 100 brazed silver-soldered aluminumsoldered joints its structure Wing Continued page 152 September 1984 49 Bob Dolly learned fly prototype quarter-scale Aeronca K back 1941 clue can find Precision Scale model l real thing ii blades grass look proportionally too largel Bob built lightIts under 12 lb Structure completely assembled Super Jet cyanoacrylate glue Power OS Gemini 12 cu 4-stroke twin-cylinder engine perfect dimensions model Bob diagulsed OSs exhaust pipe look like prototypes carburetor air Intake pipecomplete simulated air cleanerlcarb heater box Functional shock-strut landing gear brazed assembly steel tubes Right Stufl UampDeii enjoys realism safety System 303 Lectra-Starters beautiful F7F Tiger Cat 422 Main St Dept MA Irwin PA 15642 Phone 412 864-4959 Send $150 today receive fully illustrated catalog BY LEE TAYLOR MAA POUNDER & PRO PHOTOGRAPhER SUPER two-hour long video cumu lative product TEN YEARS active shooting Featuring 165 LB GRUMMAN GOOSE 16 8-17 16 SPRUCE GOOSE MASTERS CHAMPION SHIPS AMA NATIONALS & MORE Recorded VHS Hi-Grade Video Tape $3495 C&EIF eRSIDENTs $3705 It TAC SEND 5A5E P05 DES SEND CREEK 05 MONEY ORDER TO recovery back course plan worked much better year lean towards types record-setting flights its worth passing whatand howthe experts plan Obviously weather biggest fac torjust behind safety Late spring early summer seem provide best odds good lift conditions However outsmart fickle winds Jack company have set up four basic courses direction north east south west. directions would planned grid pattern farmland country roads doesnt include courses other directions farm roads have very little traf fic selected reasons safety Besides low traffic roads sidestep towns planning near perfect May 26 however wind direction could have better Out northwest 10 24 knots quartering tailwind cause course correc tions hoped since lift light throughout flight No long runs made between thermals course required fourteen 900 turns flight work being Declared Distance attempt meant landing take place within 300 meters spot AMA record 500 meters FAI record Starting 1100 am landing 441 pm 5410 flight covered 9147 miles 14729 kilometers new AMA record tentative FAI record AMA record breaks Dale Folkenings 4282 miles set October 1982 Dale Contest Director Jacks flight Nice guy plane used Pegasus plan No 307 Model Aviation August 1980 copy holds current Open Distance record 10412 miles Altitude record 6025 feet now hangs AMA museum flight ran Braidwood IL south Urbana IL Villa Grove May 27 young Brian Isenhart flew stock Aquila using Miller airfoil modification 126 miles set new record Junior category Still feeling good about June 3 Brian set Standard-class Altitude record 3000 feet plane specially-designed fuselage capable carrying Replogle barograph Photos will appear next months column reference AMA model air plane records March1984 see June 1984 issue Model Aviation page 119 Im finally going put snow shovels away Postal contest Back April 1984 col umn results given Pinellas Soaring Associations postal contest An invitation also offered inter ested clubs compete second postal meet Six clubs countries com peted onea contest dif ferent twist As mentioned back April tasks contest would include sixminute Duration spot landing four-lap F3B Speed kicker would both tasks would flown same weight during same round Results Club Southern Soaring Club Brisbane Pinelas White Sheet FSV Versmold Wellington Country South Africa Australia USA England Germany New Zealand Points 26156 25134 23457 20253 19262 9732 club team scored its best five fliers Best Speed time 240 seconds John Lightfoot South Africa John also best individual score four rounds 6127 team Germany flew fly ing wings Bad weather plagued con test two maxes recorded best Speed time 39 seconds Incidently Sean Walbank top British flier contest edits publishes fine magazine called White Sheet Its quarterly Spring 1984 issue crammed over 40 pages flying wing designs Austria Eng land Germany USA years subscription five English pounds its pound well spent Send subscription request Sean Walbank Editor 29 Gardens Acreman St Sherborne Dorset DT9 3PD England youre interested next postal contest write Kale Harden 3184 Brunswick Circle Palm Harbor FL 33563 USA Good Lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 RC ScalelWischers Continued page 49 struts alone made gum hard wood have 24 silver-solder joints fittings Some aluminum soldering done hobby-shop-type tubing 015 wall thickness can bit tricky Too much heat parts fall floor molten globules Too little heat solder will flow desirable fillet Two critical factors determine success brazing aluminum-soldering silver-soldering small model parts flame intensity brazing-rod diameter flame must completely adjustable must held work longer time necessary obtain good flow fillet being formed rod diameter too great heat will needed melt rod heat parts being joined meltdown parts real hazard As mod el size increases have found need brazed joints smaller models used almost have produced lot scrap learning join light metal pieces greatest advantage brazed joints strength available small light parts helps reduce overall model weight 1937 Aeronca K two-place side-by-side trainer sport-type airplane also known Scout followed C-3 Master 1936 used same basic two-cylinder E-l 13C engine built Aeronca earlier models updated 40 45 horspower its final form K became KC four-cylinder Continental A-40 engine K same span chord wing36 ft 50 inas C-3 152 Model AviationContinued page 154 Great footage BEST GIANT SCALE SEAPLANES SPORT FLYING UNUSUAL AIRCRAFT HELICOPTERS & MASTERS SCALE CHAMPIONS AC K-U-TROLL ER 6 Channel Direct Servo Controller Kit PuIe & Fane gate adiuaable Erar NuitvtabIe 06 Nng 0 Psi PuItes Cis-u-TROtLEn Car Entwkuostjaei NiCd SOtno banern Cho vaNS included No need tie up frestuency have pro bleto airplane Plug ACK-U-TROILER aod chech engine elevator ailerons upto 6 Ehan nels Receiver modification rettuired some radios uhinple build simple use five 5 slide pots contrOl 5 channels switch 6th nGreat use installing radio new airplane No need use Tx setup throws etc Radio inpound flying site have engine problem NO problem have ACK-U TROLLER helter product modetee HS N ELECTRONICS iN Power Soar New Heights LT-50 GEAR MOTOR Leisures Gear Drive conversion 31 powerful IT-SO develops up 2 lbs static trhrust Gear Drive also features ball bearing Delrinlbrass gearing glass loaded polycarbonate housing Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspringllrvine/CA 92714 z APPLIED DESIGN CORPORATION 738 Penn SI El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded hIs cur Handy Ia Held Easy Ia Une $225 MINI-STRIPS PRECISION DIE-CUT MedIum Garnet SAVES TIMEREPLACEMENTFine Garnet AND EFFORT $145SANDinG BELTSAmId Waler Praol TEE jji ALUMINUM EXTRUSION SANDING BLOCK hr use 1111 RUFF-STUFF Bell-adhesIve sand peper Large True Serace WeolWeerOuI 11 Inch $250 Haedy Ia Uae 22 inch $365 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAMS Easy Use Ne asessy glue drying lime MediumFlee r Floe $92 M N L5 SAW $650 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw has ragged dIe-coal frame willi cemlrlahle chlp-preel plealle ho ned handle Receding ne aed ad juslable B blade glees Bead work access Cuts weed planlic metal sod HARDENED MUSIC WIRE extra blades-31$199 next generation Aeroncas becaine familiar Chief 50- 65horsepower flat-four engines Conti nental Span Chief remained same wing chord increased 58 considerable addition wing area K destroyed wind storm described tornado hun dred airplanes airport damaged its new hemp ropes torn went over fence inverted Only engine landing gear salvageable engine brought us $100 modelers will know price OS Gemini model engine today Incidence angles hear repeated re quests information about proper inci dence angles wing stabilizer models Longitudinal dihedral angular difference between incidence angles wing stabilizer typically greater full-size airplanes Scale models seems particular ly true aircraft produced 1920-40 era Aeronca K 40 nega tive incidence angie stabilizer lead ing edge lower hinge line combined 20 positive inci dence wing total difference 60 angles measured relative thrust line horizontal fuselage reference line Other examples found Beechcraft 17 series Staggerwings 5140 longitudinal dihedral plus 2140 downthrust Aeronca Champion 4140 Taylorcraft 50 examples fixed stabilizers eleva tor trim tabs sufficiently pro nounced visible actually measuring airplane parked viewed side side view shows thrust line stabilizer parallel wing set positive incidence angle means airplane will fly tail-high built-in downthrust opposite may also true has ridden Boeing 747 knows floor seems slope downward rear flying straight level some airplanes because tail surfaces working disturbed airwing downwash examplethe angular differ ence may exaggerated ef fect always present Others may have adjustable stabilizers minus 50 plus 20 principle angular difference intended promote stability pitch moae nose position disturbed downward direction example speed increases flow air over negatively-set stabilizer increases downward pressure raise nose thereby regain equilibrium reverse true nose raised speed decreases stabilizer down-pressure reduced lower nose stabiliz er set negative angie will stall after positively-set wing has stalled helps maintain control during stall maneuvers such three-point landing speed creases dive beyond design value red-line speed marked airspeed dicator risk stabilizer may fail due downward force especial ly added load suddenly-ap plied up-elevator Yes wire bracing tail surfaces Scale models functional Longitudinal dihedral drag-induc ing element aircraft design Old-time pilots knew trick using slight dive gather speed trimming bit down elevator reduce wings angle attack decrease its induced drag get speed cruise rpm would trim nose-down hold down-elevator ward pressure control wheel stick could somewhat tiring long cross-country flight Too much push began lose altitude paid off airspeed increases five 10mph B-29 pilots making round trip Tinian Japan during WW II used trick conserve fuel could mean safe return base instead ditching club members made trip regularity offered information Scale models can built gular difference equal proto type Because engine weight fullsize airplane may typically constitute / total weight center gravity would forward compared its lo cation normal modeling practice model would need add nose weight compensate lightweight engine alternative fly model constant application down eleva tor imposes load elevator servo resulting abnormal battery drain effect stabilizer would tempting lower tail eleva tor tries raise ensuing high drag condition tab effect pro duces pitch variations speed changes Therefore large angular difference RC Scale models would undesirable because want control contrasted Free Flight Scale models ex cess pitch stability necessary preference decrease angu lar difference about 20 total Aeronca K willingly accept nonscale appearance stabilizer set improper angle Only expert judge aircraft would detect variation scale otherwise spelled cheating Ac tually high-wing aircraft like Aeronca downwash component wing increases effective angular difference Without wind tunnel equipment aerodynamic knowledge make guess amount angle reduction needed prove ourselves guess correct model responds flight should no lack pitch-stability other words cant argue success Paying close attention some popular Scale kits have noted uncommon design feature means can balance model about 25% 30% wing chord aft leading edge preferably shifting 154 Model Aviation Add 20% postage Send 2K catilog batteries rather adding nose weight 25% figure recommended RC Scale models avoid problems tailheaviness old Scale modelers bugaboo inadvertent snap-roll Changing incidence stabilizer will have some effect elevator travel re quirements tail-dragger airplane add bit extra up-elevator travel assure getting tail wheel down runway pretty three-point landing As airspeed diminishes near stall smooth landing elevator becomes progressively less effective full-stall landing Aeronca elevator uptravel 200 Since supposedly non aerobatic ship down-travel inconse quential aerobatic types airplane full-symmetrical airfoil use down up Tailspins also re quire substantial amount up-elevator snap rolls maneuvers 200 up travel may quite enough Since usually include spins ma neuver list performed regu larly K during flight training prefer provide adjustment elevator travel somewhere linkage cer tam sufficient travel K model enters slowly revolving spin com mand stops spinning delay instant controls neutralized Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC AerobaticslVan Putte Continued page 51 about change pace serious Pattern talk Ken Willard will pardon expression something Sunday fli er will understand appreciate Pre pare yourself fall off chair youre sitting following published RF Signal newsletter Isotopes R/C Model Club Owensboro KY edited Ron Epple Although credit ed believe Ron Epple wrote follow ing Building TipsAs lot al ready know am constantly being asked advice building flying large share World-class fliers have now decided share few secrets First open up box new kit turn upside down floor Dont worry pieces will go back in. larger box Find thickest deepest-pile carpet home examine hardware will enable improvise other-size screws bolts later Start building now Dont bother pin wing plans during construc tion method beginners sissies wing may move around lit tle itll okay Pour glue over wing way will sure joint secured Rememberglue cheaper new airplane plane has low wing dont drill holes blocks landing gear now can always after covered MonoKote patches add scale effect fuselageif box type use fine super glues around quickly build two left sides taking left sides apart can admire tenacity instant glues putting engine mount firewall dont bother measure centerline isnt important Dave Brown Hanno Prettner dont own measuring instruments such rule square incidence meter airplanes fly fairly decently because have whistles bells radios Go ahead cover fin stabilizer fuselage before gluing together modern adhesives have day can glue MonoKote Mono Kote smear some glue fin ish tell everyone gave plane weathered look Nows time drill holes engine mount usually just eyeball engine drill away Heres littleknown secretmost top builders fliers like myself never screw engine down right side several reasons position engine mount proceed drill A-in drill doesnt have room right side because dumb exhaust way Also muffler goes right side believe will provide enough weight hold engine down Anyway muffler place can see have side secured anyhow Set pilot figure table next plane Now glue canopy plane After sure epoxy has set up look over pilot still table Can see him smile Never repeat never fuel-proof thing you will violate Law Attrition fuel-proofing plane will eventually limp off somewhere can send check Hazel Sig another kit repeat fun process over again Happy building Isnt beautiful Despite humor vein truth showed through caught us things weve done wed just soon hadnt done doubt escaped unscathed Im going end column some real good ideas pub lished Talespins newsletter Aeromasters Model Alrplane Club Fred ericksburg VA edited Charles Rector authored follow ing Tricks TradeEpoxy glues great things have hap pened modeling recent years youd better doggone sure want something glued because after epoxy has hardened its glued forever really can soften epoxy heat Continued page 158 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 qo * $300 QP * $35009 * $250 qp * * plu shipping source QUIET FLIGHT supplies histarts electric motors& reducers hatt er jes pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit . VISA MASTERCARD bind EY fl EMS CORPORATION ONE WOOD LANEMALVERNPA19355 21S644-06926772 Write call information September 1984 155 C btteo ,ot incluied P OWR TOW C hattsiy inc1d R ZOOM RETRIEVER